PHYLOGENETIC ANALYSIS OF MORPHOLOGICAL SPECIES OF <i>CARTERIA</i> (VOLVOCALES, CHLOROPHYTA) BASED ON <i>rbc</i>L GENE SEQUENCES<sup>1</sup>

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<jats:title>ABSTRACT</jats:title><jats:p>Four related species in the unicellular volvocalean genus <jats:italic>Carteria</jats:italic> [<jats:italic>C. crucifera</jats:italic> Pascher, <jats:italic>C. eugametos</jats:italic> Mitra, <jats:italic>C. inversa</jats:italic> (Korshikov) Bourrelly and <jats:italic>C. cerasiformis</jats:italic> Nozaki et al.] were delineated on the basis of recent comparative light and electron microscopy of a large number of culture strains. However, the species thus delineated may not represent natural or monophyletic entities. In the present study, 1128 base pairs of the chloroplast protein‐coding gene (large subunit of ribulose‐1,5‐bisphosphate carboxylase/oxygenase gene) from 12 <jats:italic>Carteria</jats:italic> strains representing the four species as well as from related volvocalean species were analyzed to elucidate the phylogenetic status of the taxonomic or morphologic species of <jats:italic>Carteria</jats:italic>. The sequence data showed that the 12 <jats:italic>Carteria</jats:italic> strains exhibit four robust monophyletic groups which are strictly consistent with the four taxonomic species. These results are discussed in relation to contrasting results found in other microalgal genera. It is concluded that phylogenetic analysis, based on DMA sequence data and comparative morphologic characterization of species and using a large number of culture strains, is essential to a natural system of microalgal species taxonomy.</jats:p>

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